CN211650816U

CN211650816U - Prefabricated energy pile application structure

Info

Publication number: CN211650816U
Application number: CN201922398769.4U
Authority: CN
Inventors: 姚攀峰
Original assignee: Beijing Peak Construction Engineering Technology Research Institute Co ltd
Current assignee: Beijing Peak Construction Engineering Technology Research Institute Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-10-09
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses a prefabricated energy pile application structure, which comprises a hollow pile connected under a foundation, exchange liquid arranged in the hollow pile, a sealing device connected with the pile top of the hollow pile, a heat exchange pipe connected among an indoor heat exchanger, the sealing device and the exchange liquid, and an auxiliary pipe connected between the sealing device and the exchange liquid; the hollow pile comprises a hollow pile body and a pile tip connected to the bottom end of the pile body. The utility model avoids the crack and heat loss between the heat exchange tube and the pile body by arranging the exchange liquid in the hollow pile; by arranging the sealing device, on one hand, the sealing device is connected with the foundation longitudinal rib or a mattress layer is arranged, so that the integrity of the mounting structure is enhanced, and on the other hand, the heat exchange tube and the auxiliary tube are convenient to mount by arranging the exchange tube hole and the connecting hole; and the arrangement of the sealing layer, the sealing ring and the heat insulation layer is beneficial to the storage of geothermal energy.

Description

Prefabricated energy pile application structure

Technical Field

The utility model belongs to the technical construction field of the underground pile body, in particular to prefabricated energy pile application structure.

Background

A Ground source heat pump (Ground source heat pump) takes Ground source energy as an energy supply main body and provides energy for cooling in summer and heating in winter. Because the ground source heat pump utilizes the terrestrial heat resources (usually less than 400 meters deep) on the superficial layer of the earth as cold and heat sources to carry out the heating and air conditioning system of energy conversion, and the superficial layer of the earth is a huge solar heat collector which is not limited by regions, resources and the like and is really large in quantity and wide in range and everywhere; the renewable energy stored in the shallow layer of the earth surface is nearly unlimited, so that the earth energy also becomes a form of clean renewable energy, and the environmental benefit is remarkable; and can be applied to buildings such as hotels, shopping malls, office buildings, schools and the like, and is more suitable for heating and refrigerating of villa houses.

In the 80's of the 20 th century, heat exchange tubes were placed in reinforced concrete pile foundations in the engineering community, and were called pile foundation buried tube geothermal heat exchangers, also called energy piles. At present, the commonly used energy pile foundation pile is a reinforced concrete pile, because the buried pipe is directly contacted with the reinforced concrete pile, the chemical and mechanical stability of the concrete is poor under the action of long-time temperature difference and external environment, and the expansion joint and local deformation are easy to generate and are difficult to use for a long time due to different thermal expansion coefficients of the concrete and a heat exchange pipe; some energy piles are hollow, and an air layer exists between the buried pipe and the pile body; due to the existence of the air film, the heat conduction efficiency of the energy pile is greatly reduced, and the heat capacity of the concrete is low, so that the temperature is unstable. The other method is to pour the pile body on site, which has the defects of large pollution on site, difficult treatment of slurry and the like; or some energy pile bodies are not easy to operate and have low bearing capacity.

SUMMERY OF THE UTILITY MODEL

The utility model provides a prefabricated energy stake application structure for solve the energy stake and easily produce the crack and warp, the utilization efficiency is low and bear little technical problem when using for a long time.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a prefabricated energy pile application structure comprises a hollow pile connected below a foundation, exchange liquid arranged inside the hollow pile, a sealing device connected to the pile top of the hollow pile, a heat exchange pipe connected among an indoor heat exchanger, the sealing device and the exchange liquid, and an auxiliary pipe connected between the sealing device and the exchange liquid;

the sealing device comprises a plugging piece connected to the pile top of the hollow pile, a plugging piece longitudinal rib and a plugging piece hoop rib which are connected to the inside of the plugging piece, and an exchange pipe hole and a connecting hole which are arranged on the plugging piece; the connecting hole corresponds to the auxiliary pipe and is provided with at least one, and the auxiliary pipe comprises a monitoring pipe and/or a pumping and injecting pipe and a monitoring pumping and injecting integrated pipe.

Furthermore, the heat exchange tube is made of a waterproof heat conduction material, the heat exchange tube penetrates through an exchange tube hole on the self-sealing device and penetrates out of the other exchange tube hole, and the end part of the heat exchange tube is positioned in the exchange liquid.

Further, water is injected into the heat exchange tubes and circulates between the heat exchange tubes and the indoor heat exchanger; the area and the length of the heat exchange tube placed in the exchange liquid are adapted to the area and the length which are needed to be experienced by the temperature change circulation of the water injected into the heat exchange tube.

Further, the heat exchange tubes are arranged in a U shape, a multi-stage U shape, a W shape or a spiral shape in the exchange liquid; the exchange liquid is water, and the liquid level of the exchange liquid is at the depth position with the stable temperature of the underground soil layer of 0 ℃ or above.

Further, the hollow pile comprises a hollow pile body and a pile tip connected to the bottom end of the pile body.

Further, the pile body is coated with waterproof paint or an impermeable layer is arranged between the pile body and exchange liquid; the barrier layer comprises a barrier sleeve, a barrier film, or a barrier film.

Further, the pile body is a concrete pipe pile, a steel pipe pile, a reinforced concrete pipe pile or a prestressed reinforced concrete pipe pile; the pile tip and the pile body are integrally prefabricated, welded or cast in place; or the pile body is formed by assembling a plurality of sections, the assembling positions are welded or bolted and welded through end steel plates, and waterproof and/or anticorrosive layers are arranged at the connecting positions.

Furthermore, the size of the plugging piece is suitable for the size of the hollow pile, and the plugging piece is formed by pouring and prefabricating concrete; a sealing coating is arranged at the connecting surface of the plugging piece and the hollow pile, a sealing ring is arranged at the connecting top, and a heat insulation layer is arranged at the bottom of the plugging piece; or the plugging piece is formed by pouring concrete in situ.

Furthermore, the longitudinal ribs of the plugging piece and the stirrups of the plugging piece are arranged at intervals, and the longitudinal ribs of the plugging piece are anchored into the foundation; or the top of the longitudinal rib of the plugging piece is flush with the top of the plugging piece, and a mattress layer is arranged between the plugging piece and the foundation.

Furthermore, the hollow piles are arranged at intervals in the indoor foundation range, each hollow pile comprises two groups of bearing and non-bearing, and the actual bearing strength of the bearing hollow pile is greater than or equal to the designed bearing strength.

The beneficial effects of the utility model are embodied in:

1) the utility model arranges the exchange liquid in the hollow pile, so that the heat exchange tube is not in direct contact with the pile body, and the crack between the heat exchange tube and the pile body is avoided; the exchange liquid consists of water, the specific heat capacity of the water is large, geothermal energy is easy to store, and heat loss is avoided;

2) the utility model, by arranging the sealing device, on one hand, is connected with the foundation longitudinal bar or is provided with the mattress layer, thereby enhancing the integrity of the installation structure, and on the other hand, the heat exchange tube and the auxiliary tube can be conveniently installed by arranging the exchange tube hole and the connecting hole; the sealing layer, the sealing ring and the heat insulation layer of the sealing device are all favorable for storing geothermal energy;

3) the utility model is beneficial to monitoring the liquid level of the exchange liquid in the hollow pile in use and replacing or supplementing the exchange liquid after long-time use through the arrangement of the auxiliary pipe;

the utility model discloses, through the design of pouring into the exchange liquid in the hollow pile, effectively promote the heat exchange rate, avoid the air bed that forms for a long time, lead to the heat conductivity to descend by a wide margin, can guarantee the storage of energy, reduce construction cost; the system is easy to install, convenient and fast to construct and beneficial to energy conservation and environmental protection; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.

Drawings

FIG. 1 is a schematic diagram of a prefabricated energy pile application structure;

FIG. 2 is a schematic cross-sectional view of a hollow pile body;

FIG. 3 is a schematic view of a pile tip structure of the hollow pile;

FIG. 4 is a schematic view b of a pile tip structure of the hollow pile;

FIG. 5 is a schematic view a of the closure attachment configuration;

FIG. 6 is a schematic view b of the connection structure of the closure device;

fig. 7 is a schematic transverse cross-section of a closure device.

Reference numerals: 1-indoor, 2-foundation, 3-hollow pile, 31-pile body, 311-concrete, 312-pile stirrup, 313-pile longitudinal bar, 32-pile tip, 4-exchange liquid, 5-heat exchange pipe, 6-auxiliary pipe, 7-sealing device, 71-sealing piece, 72-sealing piece longitudinal bar, 73-sealing piece stirrup, 74-exchange pipe hole, 75-connecting hole, 8-mattress layer and 9-impermeable layer.

Detailed Description

As shown in fig. 1, a prefabricated energy pile application structure comprises a hollow pile 3 connected below a foundation 2, an exchange liquid 4 disposed inside the hollow pile 3, a closing means 7 connected to the pile top of the hollow pile 3, a heat exchanger connected to a room 1, a heat exchange pipe 5 between the closing means 7 and the exchange liquid 4, and an auxiliary pipe 6 connected between the closing means 7 and the exchange liquid 4; the hollow pile 3 comprises a hollow pile body 31 and a pile tip 32 connected to the bottom end of the pile body 31, and an impermeable layer 9 is arranged between the pile body 31 and the exchange liquid 4; the anti-seepage layer 9 comprises an anti-seepage coating layer, an anti-seepage film or an anti-seepage film.

As shown in fig. 2, the hollow pile 3 is a reinforced concrete pipe pile, and the pile body 31 is formed by binding a pile stirrup 312 and a pile longitudinal bar 313 into a reinforcement cage and pouring concrete 311; the hollow pile 3 may also be a steel pipe pile. As shown in fig. 3 and 4, the pile tip 32 is made of steel or concrete 311 and is prefabricated in one piece. The hollow piles 3 are arranged at intervals in the range of the foundation 2 of the indoor 1, the hollow piles 3 comprise two groups of bearing and non-bearing, and the actual bearing strength of the bearing hollow piles 3 is greater than or equal to the designed bearing strength. In a deep part of the geothermal design and installation, the single-section hollow pile 3 can not meet the depth requirement, the pile body 31 is composed of a plurality of sections of prestressed reinforced concrete pipe piles, end steel plates are welded or bolted welded and combined among the prestressed reinforced concrete pipe piles, wherein the steel plates are made of stainless steel or weathering steel; and a waterproof and anticorrosive layer is arranged to prevent liquid leakage and corrosion damage.

In this embodiment, the heat exchange tubes 5 are made of a water-impermeable and heat-conductive metal material, and the heat exchange tubes 5 are arranged in the exchange liquid 4 in a U shape, or in addition, in a multi-stage U shape, a W shape, or a spiral shape. The heat exchange tube 5 penetrates from the exchange tube hole 74 on the closing device 7 and penetrates out from the other exchange tube hole 74, and the end part of the heat exchange tube 5 is positioned in the exchange liquid 4.

When the heat exchanger is used, water is injected into the heat exchange tube 5, the water circulates between the heat exchange tube 5 and the heat exchanger in the indoor 1, the water in the heat exchange tube 5 releases heat or absorbs heat in the indoor 1 when in the indoor 1 and exchanges heat with heat of an underground soil body, and the heat exchanger is beneficial to refrigeration or heat preservation of the indoor 1 due to the stable temperature of the underground soil body. The area and length of the heat exchange tube 5 put into the exchange liquid 4 are adapted to the area and length of the heat exchange tube 5 needed to be changed and circulated by the temperature of the water injected into the heat exchange tube 5, corresponding to different indoor 1 space and temperature regulation requirements. In this embodiment, the exchange liquid 4 is also water, the specific heat capacity of water is large, heat is easy to store, and the liquid level of the exchange liquid 4 is at a depth position where the stable temperature of the underground soil layer is 0 ℃ or more.

As shown in fig. 5 to 7, the closing device 7 comprises a plugging member 71 connected to the pile top of the hollow pile 3, a plugging member longitudinal rib 72 and a plugging member hoop rib 73 connected to the inside of the plugging member 71, and an exchange tube hole 74 and a connecting hole 75 provided on the plugging member 71; the connection holes 75 are provided in two, one being a monitoring tube hole and the other being a suction and injection tube hole, or the connection holes 75 are provided in one for a common hole for both the monitoring tube and the suction and injection tube.

In this embodiment, the plugging member 71 is a circular column prefabricated by concrete pouring, and the size thereof is adapted to the size of the hollow pile 3; the sealing coating is arranged at the connecting surface of the plugging piece 71 and the hollow pile 3, the sealing rubber ring is arranged at the connecting top, and the heat insulation coating is arranged at the bottom of the plugging piece 71. In addition, the blocking piece 71 can be formed by casting in situ, a baffle is pre-embedded at the designed position in the hollow pile 3 for casting concrete, the top is capped or directly cast through a template with a grouting hole, and the next procedure can be performed after the maintenance is finished.

In the plugging member 71, the plugging member longitudinal ribs 72 and the plugging member stirrups 73 are arranged at intervals, and the tops of the plugging member longitudinal ribs 72 are welded with the longitudinal ribs in the foundation 2. Or the vertical blocking piece ribs 72 of the mattress layer 8 are arranged on the top of the blocking piece 71 and do not penetrate through the mattress layer 8.

With reference to fig. 1 to 7, the construction method of the application structure of the prefabricated energy pile is further described, and the specific steps are as follows:

step one, in the underground construction stage, according to the design bearing and construction plan, determining the size, material and distribution position of the hollow pile 3; and determining the embedding depth of the hollow pile 3 and the elevation of the exchange liquid 4 in the hollow pile 3 by combining the geological data and the surveying data in the previous period. Wherein, when the elevation of the exchange liquid 4 is determined, the stable temperature of the underground soil layer is 0 ℃ or above according to the design requirement.

Step two, processing the hollow pile 3, marking according to the actual position on site, and driving or pressing the hollow pile 3 into the ground on site according to the mark; during processing, the inner side of the hollow pile 3 is coated with an impermeable layer 9.

And step three, processing the hollow pile 3, combining the hollow pile 3 to manufacture a sealing device 7 according to the actual position mark of the site, wherein an exchange pipe hole 74 and a connecting hole 75 are reserved on the sealing device 7 according to the design requirement, and the end part of the longitudinal rib 72 of the plugging piece extends out of the top of the plugging piece 71.

In this embodiment, two connection holes 75 and two exchange tube holes 74 are provided, wherein the two exchange holes are respectively used for the inlet and outlet of the heat exchange tube 5, and the two connection holes 75 are respectively used for the penetration of the auxiliary tube 6 for monitoring and pumping injection; sealing rubber rings are respectively and correspondingly connected to the connecting holes 75 and the exchange tube holes 74.

Processing a closing device 7 by combining the manufactured hollow pile 3, wherein an exchange pipe hole 74 and a connecting hole 75 are reserved on the closing device 7 according to design requirements, and the end part of the longitudinal rib 72 of the plugging piece extends out of the top of the plugging piece 71; wherein the top of the vertical ribs 72 of the plugging piece is flush with the top of the plugging piece 71 if the mattress layer 8 is arranged.

Step four, placing the exchange liquid 4 and the heat exchange tube 5 into the hollow pile 3, and extending two ends of the heat exchange tube 5 out; wherein the level of the exchange liquid 4 is monitored and rechecked to keep it at the design level. Wherein the exchange liquid is water, and when the exchange liquid is stable and the elevation is unchanged, the next procedure is carried out.

And step five, installing a sealing device 7 at the top of the hollow pile 3, enabling the heat exchange tube 5 to penetrate out of the heat exchange tube hole 74, and penetrating the auxiliary tube 6 into the connecting hole 75. Coating sealant on the front side surface of the sealing device 7 before installation, installing a sealing ring on the top of the sealing device 7 after installation, and installing a heat insulation layer on the bottom; or the sealing device 7 is formed by casting in situ, the longitudinal ribs 72 and the stirrup 73 of the sealing part are bound in advance before casting, the length of the longitudinal ribs 72 of the sealing part is selected according to whether the mattress layer 8 is arranged, and then casting in situ and maintenance are carried out.

Step six, the mattress layer 8 is not arranged, the longitudinal ribs 72 of the plugging piece are connected with the longitudinal ribs in the foundation 2, and the foundation 2 and the ground building part are constructed; and arranging a mattress layer 8, and directly constructing the foundation 2 and the ground building part after the mattress layer 8 is constructed.

When the foundation 2 and the above-ground building part are constructed, the heat exchange tube 5 and the auxiliary tube 6 which extend out of the sealing device 7 and the ground are temporarily blocked; wherein, can increase when foundation 2 construction and lay screed-coat, waterproof layer and heat preservation to increase the roughness, waterproof nature and the heat insulating ability of foundation 2.

And seventhly, after the construction of the ground building is completed, connecting the heat exchange tube 5 with the heat exchanger in the indoor part 1, and respectively connecting the auxiliary tube 6 with the monitor and the water pump, thereby completing the construction and installation of the application structure of the prefabricated energy pile.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. A prefabricated energy pile application structure is characterized by comprising a hollow pile (3) connected below a foundation (2), a exchange liquid (4) arranged inside the hollow pile (3), a sealing device (7) connected to the pile top of the hollow pile (3), a heat exchanger connected to a room (1), a heat exchange pipe (5) between the sealing device (7) and the exchange liquid (4), and an auxiliary pipe (6) connected between the sealing device (7) and the exchange liquid (4);

the hollow pile (3) comprises a hollow pile body (31) and a pile tip (32) connected to the bottom end of the pile body (31);

the sealing device (7) comprises a sealing piece (71) connected to the pile top of the hollow pile (3), a sealing piece longitudinal rib (72) and a sealing piece stirrup (73) connected to the inside of the sealing piece (71), and an exchange pipe hole (74) and a connecting hole (75) arranged on the sealing piece (71); the connecting hole (75) is arranged corresponding to the auxiliary pipe (6) and is at least provided with one, and the auxiliary pipe (6) comprises a monitoring pipe and/or a pumping and injecting pipe and a monitoring pumping and injecting integrated pipe.

2. A prefabricated energy pile application structure according to claim 1, wherein said heat exchanger tubes (5) are made of a water-impermeable and heat-conductive material, the heat exchanger tubes (5) are inserted from the exchanger tube holes (74) of the closing means (7) and are inserted from another exchanger tube hole (74), and the ends of the heat exchanger tubes (5) are located in the exchange fluid (4).

3. A prefabricated energy pile application structure according to claim 2, wherein said heat exchanging tubes (5) are filled with water, which circulates between the heat exchanging tubes (5) and the heat exchanger of the indoor room (1); the area and the length of the heat exchange tube (5) placed in the exchange liquid (4) are adapted to the area and the length which are needed to be experienced by the temperature change cycle of the water injected into the heat exchange tube (5).

4. A prefabricated energy pile application structure according to claim 3, wherein said heat exchange tubes (5) are arranged in a U-shape, a multi-stage U-shape, a W-shape or a spiral shape in the exchange liquid (4); the exchange liquid (4) is water, and the liquid level of the exchange liquid (4) is at a depth position with the stable temperature of the underground soil layer of 0 ℃ or above.

5. A prefabricated energy pile application structure according to claim 1, wherein said hollow pile (3) comprises a hollow pile body (31) and a pile tip (32) connected to the bottom end of the pile body (31).

6. A prefabricated energy pile application structure as claimed in claim 5, wherein said pile body (31) is painted with a waterproof paint or an impermeable layer (9) is provided between the pile body (31) and the exchange liquid (4); the barrier layer (9) comprises a barrier sleeve, a barrier film or a barrier film.

7. A prefabricated energy pile application structure according to claim 5, characterized in that said pile body (31) is a concrete pipe pile, a steel pipe pile, a reinforced concrete pipe pile or a prestressed reinforced concrete pipe pile; the pile tip (32) and the pile body (31) are integrally prefabricated, welded or cast in place; or the pile body (31) is formed by assembling a plurality of sections, the assembling positions are welded or bolted and welded through end steel plates, and waterproof and/or anticorrosive layers are arranged at the connecting positions.

8. A prefabricated energy pile application structure according to claim 1, wherein said block piece (71) is sized to fit the hollow pile (3), the block piece (71) being prefabricated by concrete casting; a sealing coating is arranged at the connecting surface of the plugging piece (71) and the hollow pile (3), a sealing ring is arranged at the connecting top, and a heat insulation layer is arranged at the bottom of the plugging piece (71); or the plugging piece (71) is formed by pouring concrete in situ.

9. A prefabricated energy pile application structure according to claim 1, wherein the longitudinal blocking piece ribs (72) and the longitudinal blocking piece stirrups (73) are arranged at intervals, and the longitudinal blocking piece ribs (72) are anchored into the foundation (2); or the top of the longitudinal rib (72) of the plugging piece is flush with the top of the plugging piece (71), and a mattress layer (8) is arranged between the plugging piece (71) and the foundation (2).

10. A prefabricated energy pile application structure as claimed in claim 1, wherein said hollow piles (3) are arranged at intervals in the base (2) of the room (1), the hollow piles (3) comprise two groups of bearing and non-bearing, and the actual bearing strength of the bearing hollow piles (3) is greater than or equal to the design bearing strength.